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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b0098112b452c9fbf39291a17b43fd6738d124abb3c74dd9f43c2796e1d271' 
  AND token = 'Ey7JuAxB8uNGBv3OnrZfagbIOx5ph2tvUirwdMWY8/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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