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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547c2b0ecaa99d30bdcf7c9443cbfd7e7d645c9e62f21f70f93b97efdf0a620f' 
  AND token = '8GoLrX5VTh1KM4MHLaJewsL9tID8vx25/KpVNpVeDS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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