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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d5afb99451d688b32f4f168915d9395208a68e5d15a092c90390c63d88567d' 
  AND token = 'Uywv5DYlZZ0Lbe42YZHcOG1PASKkBwygUJy70GyKSbE=' 
  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"
    }
  }
}