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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2559b4a8884f69a35fe76def1a4e9d22d647fce0fcbc90cc8c31095705056e' 
  AND token = 'e9qFMnclFTPJ5v3o4jasy28b6enR/2jBV1P5+clapTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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