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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e49c445a9220803b435e4b60f1ba067564eff1a8d8e20c4a2cbafdaa5cddc431' 
  AND token = 'hw3F6KzsT7+6i/xUEY4lz42H8wj/wrLiWixE7mA0V9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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