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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e44aab2158e837c9db920c816bfe92eab5cafb508bfc43b9fc8319a61479a4' 
  AND token = 't0dhlwz+eXqpMJqQA+OF4FLNRELGYaccoXo9I5GqPKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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