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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67e3f04048bcf2b3f4b6bdb684b7ea7c3f6e346ff50a0478b6f6d82a23da227' 
  AND token = '+6GxLZxvNLvj5d0fovc1jRDdGl7EkyMfQVh4afFuaKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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