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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '599d3e52752754cbb12d4a158258f9261e3e4b0b6a43c79b58b40d88b5a7892c' 
  AND token = 'T8whGEtjIEyS5PlfDaa073RZJcW7Yl46xLWQsK6l3IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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