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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c538630fd7b38beb067d741cf88ce7b09c3932f088035a22543f173b7f878473' 
  AND token = 'rALE6ODY+V7GF0pA/FbOPbaYOfXWqZhW0N9YKt+paQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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