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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f421fa14f576a55d2782f5f5816bf83d9e7fe2e9c12ad7c68a6f1dcb478b16' 
  AND token = '3O9cnW7JUEHbjFvnNh6neH6xKiDzUrYNJWAJzueHP7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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