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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be457d525b23c1a56746d0a6f19dcf00a9cbca20fb31e8ea264efad1b7804d84' 
  AND token = 'NNf/O1R5LDKJvSOKVlGOn2PSnhzW0lx5r3Yy2UxxqGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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