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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c4dabf63ef644d6b5da5af27f99223a594829f069788e673ffa49b0eb951a3' 
  AND token = 'QKt9bfmzmS+CPEbjUfGr8y/XwJ2RbumV0l8h73J13fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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