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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e8cb0579955fbc952e5c03b423c6361f9370c0cb63566d8357d886add2fc59' 
  AND token = '1Isreee2MgqypDJ6kNWS6egHx/+lVK40gtL34h1Sx7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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