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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5108bce851ec93e0cbbe725bfd9f0cf60dd33c08e850ac103b58efb6a0343202' 
  AND token = 'nKuWgT3Hv8rnBYiC5+jO0/mOGqhGWr552YGHSUrkWr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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