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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5719d3eee6f972f4aee9204bc1b72fb565b4544edd6676d5d00dcabb536ac30d' 
  AND token = '0sOCNewMNkjGqHXmocbjYweSSx4/F2anXqNvq8rWcPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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