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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26603b3d02618be7dca19e38159c8d06bcf6da9ec5577077e37b633fd5ac9ed' 
  AND token = 'exQTFpQm7b2lxPK5XbruEsB8gjDJhdOkhYlEkszc9oA=' 
  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"
    }
  }
}