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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00a55a00a24a77878d83b3567b1338f557f0ff0ea820087a6c72c7036fac34a' 
  AND token = 'RV4LDd2qw3/I6rXKp8Zb58wHY6qa1T+JCPkMpOoAo5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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