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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029608da8b70b26ff5e71585f0a94f56e4e73c38310d2bc81359f6a3427f2d97' 
  AND token = '0/1lSjJi7LOqIIdf8jaKKMG7KZ2NAUGd5E761hMV/LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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