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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16a562920988c2f3bf241e215cc85b1b7cea2fd5c0552bfd5fa04bc9440ab58f' 
  AND token = 'g306qeiNdrjJm+WqwPaw2IHcbJletUA8Mh7ljGa+D+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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