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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d3da282adb4cfa9bb658c1c7699aa8ae016666b00be6a0204f71fd7dfca5c8' 
  AND token = '61WWcw9VHZDWjMsAgFMtLbsW+aQ6vSECGjPiBEYs5aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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