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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040c05524187d261d8c54a70b2c7d63fe1a5b0ce4760c19e0d73fc6a9857017d' 
  AND token = 'DVVojFmhtna6hKC6qNYVeqGQb9+Mmb7i5bo/jeRozao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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