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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45047a8d3772bba33dab7e5e8b016541b0b9d353cd69e49c9fe9aa6d2fcfb57e' 
  AND token = 'ksddxAPmtJI20ajxWD0M2/tR/SErZaAoy+xluVyzS0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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