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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2afef76ab45249bc63e9225ce837a17821d41ee875a792c18ec05994c37c0c' 
  AND token = '6URrxxsCQjYjEVVXt6gcWME1p72umQ622jSoIIiE0G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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