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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03dc24383adea3d4e1de99bc1e2e8f054e01886190dbb49b85dd9c362991b1bf' 
  AND token = 'VfuTwf/Cjj18IQgQRBZhoqYRUS0yCwisPYU0+Ks9bHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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