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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeba3a4a21a9e295b8625707c91d5a82b5b01e60ffa9ae9a4ad47845104f109a' 
  AND token = 'vW4DEAK/gj2Sx6eb5GhQjtDcUzM2W17iAgp8xfs/8eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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