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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4790c7dc5c0e07d8f35caf3b9ce86ac444d59570eef1140a1173291196808e82' 
  AND token = 'Qb4p/Z7T5O4B/8bzRnh/POUS4+eVrF6Ph5JP5Rnymxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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