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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ef1ef1ac07aee189f5b488a1ceab97f42216d0b7389e3224b36da2473e2a89' 
  AND token = 'abuGUXhWX27/U8y4SXpyFjcNOTq3UMNjx26JcmC1/LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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