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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1bcb0df9160c51949f13f06c7583a609baec545e99623adae17ee8a222071ac' 
  AND token = 'xW7Z/dlqwapsxk5vkufW3gQXrF9p9944CGkO/O1nsr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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