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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68837feb0764d51c9cc7f881293e6ae05b78c2a0998329392fc9e3cabfe5601f' 
  AND token = 'wXkAhHqI/LQS/yF6FheiwAX4uOukMHcg8UIjaVYa+aE=' 
  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"
    }
  }
}