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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aaaa507dd5b0a7ba5be2cad3008052bd8d3b802840c77a670083e5d842526d5' 
  AND token = '/xRvB9IwxFVRDj+IzmQkDyOemKskZ2g99tap1a1WmLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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