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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bdbcaa614b8fa490eafb8f724b75d73c5e17a231f9d028a579d007ac0b2914b' 
  AND token = 't6++APAvtBcVZhXulB4zmJUJLbQnfCWObnDQ++a4PI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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