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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac680a29e8663463ae4e2449ad5aa211b68def0b4ef49c23ca5e6920308a48d' 
  AND token = '1kvzHHGUP7qBZI6YIlpCgHKPmcB23wdpzipwiONu9q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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