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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1af7a77e5efcc94f1a95297aa5d3ba09c95cfc5ddd20cb6b07977ae3f8eb77a8' 
  AND token = 'wDNzh1ShmYfkusclXt0LPapX3Ai4cK7nLa5Y5vvFdP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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