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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e1d54a992779a7ccb737770b8b8b3d3d79dd2037b6b9c77683b8fcad299b39' 
  AND token = 'GyjGWhFci3RXErru779NekXx+01Y0I55+L/mb2Yaxiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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