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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f642d19f7e40eb21061ddeff84e3be846454d139fe771dbcc64ca7b3681acc3b' 
  AND token = '6CMy8a7wp4KK0QITB1ZnOJSwGMvHL1YP2RI/bLEhzsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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