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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f33be940be6ea5a3633542cd2c2ab24965e61012d991b01afc6a9b8154e1a3' 
  AND token = 'AHOtSZTG6yJ46XzabltVlIXWFI3HSXg67z0/0PhMziQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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