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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d72bdb769b9fd531a5f6aa09b30ddf12ce414275b3b3a012240cc0bb518b9a4' 
  AND token = 'jIN05is3o84ktu6VyTucjUc9ir7psLHO5mEOoUXgj+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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