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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ab990b0dfb8869352d2974356fc29a5a59f149084062a543e6d40ea5e5c2c6' 
  AND token = 'X//FwpMoVRAq77MCUzcaytZb3hzKfo8R1A2Y0rymzKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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