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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82bce43910c3dc30df827438446ad07c1252b78ea5d38ef5ed0886042cd1f200' 
  AND token = 'Xv8nsgAZo2u5mFoy65rlYgPE3w8q67vthMNPa2Vsb8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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