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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91794209bf034aac7d5d20de93ab626c9351c37cfc92f7fb95c490b8e0ac3f3c' 
  AND token = 'qK2Z1M/Bbud5wVCo3A9i09UdAZNCmuFnSlYKHebnUow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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