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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c760673f56ccac8d0cd43acaa3adf0835645c11c5714ff0832d74b974b5f3a' 
  AND token = 'LV95XdPsp9FT9YKeWILjLQkvTz3HdLH6MxYeMvPApz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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