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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfcb7ec46ea88d7d4495c8c10c35327b58491bca1883dd36f9beb4d20fe75b9c' 
  AND token = 'IeMTL6GMbis+DJk1hPnap/iRUTkeNH2mqZfpp3NBS/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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