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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3da0524873b84e2a70c4c43a0c39d9632b9417ba1b3a78f5b88eead2eb1427' 
  AND token = 's6EyA7ze8pMEMC5Fz4DXKHIzxLX4Z1xqaId5fyMWzWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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