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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5bf1b8cbbb496b559f05b318017fb8d2451983006ad2e53efb6e6d5f30d795a' 
  AND token = 'utX04PgrrJi/GbX7fn1H4VJe1yqJP+t/Uxe0Cu0+eH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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