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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bdf8ee61ae553e5dbb77b10d5fcd76a25d24f40a4eccb57acd77b5ca74a2e90' 
  AND token = 'eXSDAu3CpQaMldKWXobW3K7Yz1W/eqYTn1bBtOhsVks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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