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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe82a72125cac53809017256212826c04c4034a5e9dd5a037f3b775027024ef0' 
  AND token = 'd7G6l/pWMYnOiTL9LjI3m1d6xc7U20y9fDNnKeqabmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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