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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac428a1c84a2ae362302ba9ffd1d889d30e1676f4310286dc82d78f8650fb627' 
  AND token = '8jmLGQnZoS5YhuFrh1aeb8WBAPQtgMyk5Gh7BPF0bpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}