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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d03441c2d47d003cdc126efe137f42430f30caaa193973e8d84f68530fcd3f' 
  AND token = 'Ihx09f3IHKHOVSLflkpGa+kyeWwyjcHzigQgJ/j4Jbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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