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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9784ada7662f631ee5fb0ba01fc6e582ad91d4f305361f2b33e4c37f6df7aef0' 
  AND token = 'gvMLFF0VHMu9ZnOH7Z/6yuZatgjkUmaqVBc5CjgTBd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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