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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '714248beeda90ca55de8e52d19e95a3456d960f34578b3bb9f0fd1f925775b65' 
  AND token = 'PH/DrbwATCdk+0x2v3MX4DNkjkugxdzUWjRAbHoeJHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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