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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e799f93e0125c679ddb476578961393fe880f58436f01a59b8fada45bfe9f3' 
  AND token = '47wtR+McGzN2rZ/L0p5ezxlv8TypoPAypzMuIzmrT4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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