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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a50f3bb65a3d4b8eb3b402639b8f9c4960859b392cee48cd53c11c4fe780eb' 
  AND token = 't1LCleMr/HTU3dl9+nw7CMrAchl9qWIq8BphgF5VmU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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