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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '648aa658b53e2a32033bb21ac9283b0a053780de9488971d1837e1fdf56cdb73' 
  AND token = 'lEZdxaiD+GUqEHnBv1y+F4/ndylC2NBNo0RaFdv7+II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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