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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbff30ed395a2fe2b0d013c3070560230a4a04c0f3f4815b0b78293d505faea2' 
  AND token = 'QzKoh4dFhQLwrGHqHqhuCzm8MOUNRQcYu2QRHMasU1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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